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<<a D-ring which was conspicuously placarded for its function >>
would that be: Tail Removal Device ??

A more likely concern may be the airplane on its back and a provision for
emergency exit.  Some thoughts are:  A handle mounted to the top of the rear
windows to aid pulling them off.   Red  diagrams for Emergency access on the
outside of the fuselage as seen on military aircraft.  A knife/saw/hammer in
the cockpit.

A few years ago a Lancair 200 burned when it ran off the end of a runway
down the side of a steep canyon at a fly-in.  We left about an hour before
the accident, but my recollection is they were too far down the canyon to be
reached by anyone before fire.  Maybe a good exit system would have saved
them.          Steve